On March 4th, according to mempool data, a empty block was mined at Bitcoin height 833061 (meaning the block only contained a transaction for the block reward Coinbase) with only a 7 second time interval from the previous block height.

Miners package empty blocks for economic reasons, as it is the most sensible choice for them. In order to fully utilize this time for mining and avoid conflicts with transactions packaged in the parent block, miners cannot fill the block with transactions, meaning they can only attempt to mine empty blocks.